Size and weight is a big decision factor when you are trying to find the ideal camera for your needs.
In this section, We are going to illustrate Canon SX170 IS and Casio EX-100 side-by-side from the front, back and top in their relative dimensions. Canon SX170 IS has external dimensions of 108 x 71 x 44 mm (4.25 x 2.8 x 1.73″) and weighs 251 g (0.55 lb / 8.85 oz) (including batteries). Casio EX-100 has external dimensions of 119x67x50 mm and weighs 389 g (including batteries).
Below you can see the front view size comparison of Canon SX170 IS and Casio EX-100. Canon SX170 IS is 11mm narrower and 6mm thinner than Casio EX-100 but it is also 4mm taller.
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Canon SX170 IS is significantly lighter (138g ) than the Casio EX-100 which may become a big advantage especially on long walking trips.
Unfortunately neither Canon PowerShot SX170 IS nor Casio Exilim EX-100 provides any type of weather sealing in their body, so you have to give extra care especially when you are shooting outdoors. If weather sealing is a must-have feature for you, check these sections: Top Compact Cameras with Weather Sealing
LCD Screen Size and Features
Casio EX-100's 3.5" LCD screen is slightly larger than Canon SX170 IS's 3" screen.
In addition to the size advantage, Casio EX-100 LCD screen also has a Tilting feature
where you can change the angle of the screen to make it easier to shoot from waist or over the head levels. On the other hand, Canon SX170 IS has a fixed type screen which provides less flexibility in shooting positions compared to EX-100.